Electric switch



H. s. DQDD ELECTRIC swxrcn Filed Sept. 20-. 192.1

mama s? iiz venmi v Patented Apr. 22, 1924.

HENRY S. DODD, O'F TORONTO, ONTARIO, ASSIGNMENTS, OF ONE-FOURTH TO J SAFETY ELECTRIC APPLIANCES, LIM

Application filed September 20, 1921.

CANADA, ASSIGNOR, BY DIRECT AND MESNE AMES R. L. STARR AND THREE-FOURTHS/TO' ITED, BOTH OF TORONTO, ONTARIO, CANADA.

' mm swrrcn.

To all whom it may concern.

Be it known subject of the resident of the York, Province ion of Canada, and useful Improvements that I, HENRY S. Donn, a King of Great Britain, and

city of Toronto, of Ontario, have invented certain new county of in the Dominin Electric Switches, described in the following specification and illustrated in the accompanying 1 drawings, that form part he principal objects of the same. of this invention are, to eliminatearcing in electric switches to overcome the difliculties andto devise a form of -6 operate the moving conconsequent thereto, switch which will and damages tact to clear the stationary contact with a ve rapid action.

%e principal feature consists in the 2 rangement ,of parts,

switch arm is swung securely tion against a togg of the invention novel construction and arwhereby a pivotalits pivot and held in either the open or closed posile connection operating the pressure of a compression 26 spring. V v p Y A urther important feature consists .in the novel construction and arrangement of a rotatable contact adapted to continuously alter its contactin l0 tional view of Fi g t as Fi ing the position of the switch is open.

Figure '4 is a front elevational view of the switch member.-

surface 1n 0 eration. In the drawings, igure 1 isa si e elevamy-im roved switch.

iure 2 is a vertica sectional view showin e relative position of the parts when the switchisin the position illustrated in igure 3 is a vertical sectional view showparts when the x In the construction of switch herein illustrated, a back plate 1, preferably formed of sheet metal, is secured to a base block 2* of insulating material being provided with side flanges 3 to form a ture and from the upper ends 0 r1 d strucflangesextend a pair of parallel arms 4.

A between the arms 4 pivot pin 5 extends across the at the upper ends. U

space on the pivot pin and to the outside of t 0 arms 4 is pivotally sus ended a forked.

member 6 w ich is forme sulating material such of a suitable in-- as bakelite, such the central portion 12 the side I Serial No. 502,088.

forked member extension 7.

A circular hole 8 extends transversely through thecentral extension 7.

A p n 9 of smaller 8 is arranged-to extend through and beyond the sides of the extension 7 and upon the ends of this pin are mounted the enlarged cylindrical members 10 which form the contacting surfaces of one switch.

A hole 11 extends downwardly through of the fork member and connects with the transverse hole 8 slidably arranged a having a central downward 1 and in the hole 11 is pin 13 of insulatin adapted to'engage t e Th upper end 14 in which is ported a bifurcated bar15.

A coil com the bifurcated transverse in 9.

pivotally supar 15, the lower end resting diameter than the 1.01.

materlal which is member of the e pin 13 is formed with a jaw-s aped ression spring 16 encircles upon the pivot pin 17 connecting the pin 13 and member 15. I

A washer 18 slidably en'circlesthe bar 15 at the u per end of the spring.

A pair 0 arms 19 are pivotally mounted u on the pivot pin- 5 at the inward side 0 the arms 4 and are connected at the lower ends by a cross pin 20 which extends into the slot 21 in the bifurcated end of the bar 15 and bears against the washer 18.

The ,upper ends of the arms 19 are here shown lvo'tallyconnected to a tubular bar 22 whic forms the switch operating member when used for certain purposes, such as in electric irons but the arms 19 may be operated in any swung on their ivots. The swinging of the arms 19 on t eir pivots causes the pin 20 to slide in the slot 21 and press against the washer 18, thereby compressing the spring 16. The sliding action allows the bar 15 to swing on its pivot in the jaw end of the pin 13 and as the axis of the pin 20 crosses the line between the axis of the pivot of the arms 19 and the axis of the pivot pin 17, the pressure of the spring will cause the forked member 6 to swmg on its pivot and such action will be very rapid.

The base block 2is' formed to support a pair of plates 23 insulated from eac other and arranged to extend to either side of the contact with the plates 1 paratus such ap lication central portion 12 of the forked member 6 so as to be engaged by the cylindrical ends 10 of the switch pin 9.

The upper ends of the lates 23 are each formed with a notch 2 into which the cylindrical ends 10 enter and contact at two points. The lower side of the notches is arranged'to slo e upwardly and outwardly. so that the rol ers will engage the surface thereof and ride up thereon.

The pressure of the spring 16 against the in 13 compresses the transverse pin to the lower side of the hole 8, consequently the transverse pin when the cylindrical ends 10 come in contact with the plates 24, may lift within the hole 8 and a spring pressure contact is always assured.

The action of this switch isextremely positive being of the toggle form and by the simple operation of the arms 19 being swun upon their pivots, may e operated to engage or disengage the plates 23 and the disengaging as well as the engaging action is a snappy movement which will efiectively prevent the drawing of an arc. The arrangement of the contact pin 9 loosely within the hole 8 not only allows of a spring contact and a consequent self-ad'ustment so that wear will not affect the switch but it also enables the pin turning freely and each 23 the'frictional engagement will create a rolling efiect and a new surface will be brought to bear on same. This will ensure very positive contacts at all times.

The parts are extremely simple and of .a strong and durable nature and will not be liable to get out of order.

The contact plates with suitable b' electrical connections are secured.

This form of switch .has' been deei particularly for use in small electrics apfor many difierent purposes.

I at I claim as my invention is 1. In an electric switch, a pair of rigid contacts having inclin surfaces, an insulating membe'r pivotally supported to swing-between said' contacts, a conductor member the switch arm time it is brought into 23" are each. provided ding screws25 to which the adapted to be tbifurcatedfswitch arm and as irons but a it .is capable of "member mounted on a loosely supported transversely of said pivotal member and adapted to ride on to said contacts, spring means for holding said conductor to its outward osition, and means for swinging said insu ator member on its pivot.

2. In an electric switch, a pivotal switch' arm, a rolling contact member loosely mounted on said switch arm, a fixed contact presenting a surface arranged in an inclined relation in respect to the movement of theswitch arm, ing said roller contact outwardly toward inclined surface of said fixed contact, an

the

vmeans for swinging. the switch arm on its pivot. 3. An electric switch, comprising, a pivotal switch arm having a transverse orifice in the free end, a metallic contact member loosely' arranged in said orifice, a fixe metallic co tact adapted to be engaged by' said loose contact, a slidable member carried in said switch arm and'enga ing said loose contact, -a slotted bar pivotal y connected to the outer end of said slidable member, a compression spring encircling said slotted bar and engaging saidslidable member, and an arm supported on a pin extendinginto said slotted bar and engagi'nIg said spring. I

4. n anelectric switch, the combination of a rigid member with an insulating base,

a pair of upsecured to said'base havin wardly extending arms, a ifurcated member of insulating material pivotally suspended from said arms and having a transverse orifice in the free end, a roller member loosely mounted in said orifice and project I 90. plates ri 'dly supving an'gu ar notches mg from the sides of said bifurcated memher, a airof contact ported? om the base h enga bysaid roller mema member sli ably arranged in said engaging said loose roller member, a bar pivotally'conber,

resilient means for h ldfixed pivot having a' nected-iwith said slidable member. a compression spring encircling said bar, and a fixed pivot and having slidable contact with sai pivotal bar.

- HENRY s. DODD. 

